/Engine/Source/Runtime/Engine/Classes/Components/AudioComponent.h
Retrieves the current-time cooked spectral data of the sounds playing on the audio component. Spectral data is averaged and interpolated for all playing sounds on this audio component. Returns true if there is data and the audio component is playing.
bool GetCookedFFTData ( const [TArray](API\Runtime\Core\Containers\TArray)< float > & FrequenciesToGet, [TArray](API\Runtime\Core\Containers\TArray)< [FSoundWaveSpectralData](API\Runtime\Engine\Sound\FSoundWaveSpectralData) > & OutSoundWaveSpectralData )